private bool IsValidExtensionType(IType actualType, IType extensionType, IExtensionEnabled extension)
{
if (TypeCompatibilityRules.IsAssignableFrom(extensionType, actualType))
{
return(true);
}
// Check for a valid generic extension
IMethod method = extension as IMethod;
if (method == null || method.GenericInfo == null)
{
return(false);
}
System.Collections.Generic.List <IGenericParameter> genericParameters = new System.Collections.Generic.List <IGenericParameter>(GenericsServices.FindGenericParameters(extensionType));
if (genericParameters.Count == 0)
{
return(false);
}
TypeInferrer inferrer = new TypeInferrer(genericParameters);
inferrer.Infer(extensionType, actualType);
return(inferrer.FinalizeInference());
}
public virtual bool CanBeReachedByDowncast(IType expectedType, IType actualType)
{
if (actualType.IsFinal)
{
return(false);
}
if (IsDuckType(actualType))
{
return(true);
}
if (!IsDowncastAllowed())
{
return(false);
}
if (expectedType.IsInterface || actualType.IsInterface)
{
return(CanBeReachedByInterfaceDowncast(expectedType, actualType));
}
return(TypeCompatibilityRules.IsAssignableFrom(actualType, expectedType));
}
